Method and Device for Audio Signal Processing

1. A method for processing an audio signal, the method comprising: receiving multi-audio signals including multi-channel or multi-object signals, each of the multi-audio signals including a plurality of subband signals, and the plurality of subband signals being classified into a first subband group having only low-frequency subband signals determined based on a predetermined frequency band and a second subband group having only high-frequency subband signals determined based on the predetermined frequency band; performing, by a fast convolution unit, fast convolution on each low-frequency subband signal of the first subband group; receiving, by a tap-delay line processing unit, at least one parameter corresponding to each high-frequency subband signal of the second subband group, the at least one parameter being extracted from binaural room impulse response (BRIR) subband filter coefficients corresponding to each high-frequency subband signal of the second subband group; and performing, by the tap-delay line processing unit, one-tap-delay line filtering of each high-frequency subband signal of the second subband group by using the received parameter.

2. The method of claim 1 , wherein the parameter includes one delay information for the corresponding BRIR subband filter coefficients and one gain information corresponding to the delay information.

3. The method of claim 2 , wherein the delay information indicates positional information for a maximum peak in the BRIR subband filter coefficients.

4. The method of claim 2 , wherein the delay information has a sample based integer value in a QMF domain.

5. The method of claim 2 , wherein the gain information has a complex value.

6. The method of claim 1 , further comprising: summing the filtered high-frequency subband signals to 2-channel left and right subband signals for each subband; coupling the summed left and right subband signals with left and right subband signals generated from the low-frequency subband signals of the first subband group; and QMF-synthesizing the respective coupled left and right subband signals.

7. An apparatus for processing an audio signal, which is used for performing binaural rendering for multi-audio signals including multi-channel or multi-object signals, each of the multi-audio signals including a plurality of subband signals, and the plurality of subband signals including a first subband group having only low-frequency subband signals determined based on a predetermined frequency band and a second subband group having only high-frequency subband signals based on the predetermined frequency band, the apparatus comprising: a fast convolution unit configured to perform fast convolution on each low-frequency subband signal of the first subband group; and a tap-delay line processing unit configured to perform rendering of each high-frequency subband signal of the second subband group, wherein the tap-delay line processing unit receives at least one parameter corresponding to each high-frequency subband signal of the second subband group, the at least one parameter being extracted from binaural room impulse response (BRIR) subband filter coefficients corresponding to each high-frequency subband signal of the second subband group, and performs one-tap-delay line filtering of each high-frequency subband signal of the second subband group by using the received parameter.

8. The apparatus of claim 7 , wherein the parameter includes one delay information for the corresponding BRIR subband filter coefficients and one gain information corresponding to the delay information.

9. The apparatus of claim 8 , wherein the delay information indicates positional information for a maximum peak in the BRIR subband filter coefficients.

10. The apparatus of claim 8 , wherein the delay information has a sample based integer value in a QMF domain.

11. The apparatus of claim 8 , wherein the gain information has a complex value.

12. The apparatus of claim 7 , wherein the tap-delay line processing unit sums the filtered high-frequency subband signals to 2-channel left and right subband signals for each subband, and the apparatus for processing an audio signal further includes: a mixer configured to couple the summed left and right subband signals with left and right subband signals generated from the low-frequency subband signals of the first subband group; and a QMF synthesis unit configured to QMF-synthesize the respective coupled left and right subband signals.